Track the issue of keeping the GL context current

examples/graphicstest/src/main.rs

@@ -145,6 +145,7 @@ fn main() {
         }
 
         let size = windowed_context.window().inner_size();
+        // TODO #4: ensure GO context is current -- see if this can be done within the runtime
         render_tree.render(&mut renderer, size.width, size.height, root);
         windowed_context.swap_buffers().unwrap();
     });

sixtyfps_runtime/rendering_backends/gl/lib.rs

@@ -376,8 +376,6 @@ impl GraphicsBackend for GLRenderer {
     }
 
     fn new_frame(&mut self, width: u32, height: u32, clear_color: &Color) -> GLFrame {
-        // ### FIXME: make_current
-
         unsafe {
             self.context.viewport(0, 0, width as i32, height as i32);